Upgrade lru-cache version to 4.1.3

package.json

@@ -36,7 +36,7 @@
     "fastly-purge": "~1.0.1",
     "glob": "^7.1.2",
     "log4js": "cartodb/log4js-node#cdb",
-    "lru-cache": "2.6.5",
+    "lru-cache": "4.1.3",
     "lzma": "~2.3.2",
     "node-statsd": "0.1.1",
     "on-headers": "^1.0.1",

yarn.lock

@@ -1397,11 +1397,7 @@ longest@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/longest/-/longest-1.0.1.tgz#30a0b2da38f73770e8294a0d22e6625ed77d0097"
 
-lru-cache@2.6.5:
-  version "2.6.5"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.6.5.tgz#e56d6354148ede8d7707b58d143220fd08df0fd5"
-
-lru-cache@^4.0.1:
+lru-cache@4.1.3, lru-cache@^4.0.1:
   version "4.1.3"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.3.tgz#a1175cf3496dfc8436c156c334b4955992bce69c"
   dependencies: